WSP10689

• File Number: 8273.600
• Description: Colorado River Basin Salinity Control - Federal Agencies - USDA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1994
• Author: USDA
• Title: Grand Valley Salinity Project - 1993 Annual Monitoring and Evaluation Report
• Water Supply Pro - Doc Type: Annual Report

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and used throughout the season. In 1991, two more fields were
added for comparison of surge and conventional irrigation (26/51
and 4~/50). . site 45 from 1990 was not used .for comparison. In
1992 the BOR Program was continued and one new field' added (55/56)
and two previously monitored fields (11/39 and 49/50) were dropped"
for comparison purposes. The BOR surge program continued into.
1993.

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In 1993, only two fields with two sites each (26/51 and 55/56)
were established for side-by-side comparison of surge and
conventional irrigation (refer to section II d. for more details).
Appendix E provides a summary information and four years of data
obtained under the CSU Cooperative Extension/BOR surge project
agreement. . .

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Of the 22 irrigation sites monitored in 1993, two had sideroll
sprinkler systems and 20 had surface irrigation systeos. The
irrigation system at each site is identified in Tables 1 and 2. At
each field with a surface irrigation system, automated electronic
flow recorders were installed to measure the volume,of inflow and
outflow. These flow recorders were connected to electronic' data
.recorders. The recorders measured inflow and outflow every 10 or
30 minutes. The measured flow data was recorded and stored in the
data re.corders.

At the two sideroll sprinkler sites., the volume' of inflow was ..
obtained from in-line mechanical flow meters located on the sites.
There was no surface runoff and the votume of outflow was therefore
not measured. For the.se sites,outflow values were considered to.
be evaporation losses (Table 2).

The two radio telemetry weather stations located on the east and
west.ends of the Grand Valley measured the climatic parameters
. needed to calculate potential evapotranspiration (ETp). The
weather' data for calculations dfET data were tran~mitted directly
to the Grand Junction field office every 15 to 20 minutes from.~he
two weather stations. These data were stored in the computer for
later use.

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Crop consumptive use for each crop was determined using th$
Modified Penman equation developed by AgriCUltural Research service
(ARS), Fort Collins, Colorado~ The crop coefficient curves for ET
calculations were developed by the SCS, ARS and CSU cooperative
Extension office located in Grand Junction.

2. summary Of stream Gauging Data

No stream gauging data was collected by the SCS, The U.S"
Geological Survey (USGS) is responsible for collecting stream data.
In future annual reports, USGS data on flows and TDS will be
provided.

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